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  <title>
    reduce map 迭代器，有什么不同 ①.实现函数：同时使⽤ reduce map 迭代器，
    让数组内所有的 偶数求和 ②.实现函数：只使⽤ reduce 求奇数之和
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  <script>
    let arr = [2, 5, 6, 48, 3, 4, 56, 48, 43, 98]
    arr.map((res) => {
      let num = 0;
      if (res % 2 == 0) {
        console.log(res)
      }
    })
  </script>
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